'use strict' // 使用JS严格模式
// 导入path模块
const path = require('path')
    // 导入默认配置
const defaultSettings = require('./src/settings.js')
    // 将相对路径变成绝对路径
function resolve(dir) {
    return path.join(__dirname, dir)
}
// 设置网页标题
const name = defaultSettings.title || 'vue Admin Template' // page title

// 设置运行的端口号(第一个有值就用第一个...)
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// 关于脚手架的配置信息
// 详细可以查阅文档 https://cli.vuejs.org/zh/config/index.html
module.exports = {
    // 运行目录路径，默认是/ 是绝对路径
    publicPath: process.env.NODE_ENV === 'production' ? './' : '/',
    // 打包目录
    outputDir: 'dist',
    // 静态文件输出目录
    assetsDir: 'static',
    // eslint检测开启情况
    lintOnSave: process.env.NODE_ENV === 'development',
    // 关闭map文件
    productionSourceMap: false,
    // 项目运行服务器地址
    devServer: {
        port: port, // 运行端口
        open: true, // 是否自动打开浏览器
        overlay: {
            warnings: false,
            errors: true
        },
        //代理配置
        proxy: {
            //如果请求接口带/api，就会触发代理机制
            '/api': {
                //跨域请求的地址
                target: 'http://ihrm.itheima.net',
                //是否换源
                changeOrigin: true,
                //路径重写  假设要想把 localhost:8888/api/login 变成http://ihrm.itheima.net/login就需要这么做
                // pathRewrite: {
                //     '^/api': ''
                // }
            }
        }
        // before: require('./mock/mock-server.js')
    },
    // 对webpack进行配置  【对象式配置】
    configureWebpack: {
        // provide the app's title in webpack's name field, so that
        // it can be accessed in index.html to inject the correct title.
        name: name,
        resolve: {
            alias: {
                '@': resolve('src')
            }
        }
    },
    // 对webpack进行配置  【函数式配置】
    chainWebpack(config) {
        // it can improve the speed of the first screen, it is recommended to turn on preload
        config.plugin('preload').tap(() => [{
            rel: 'preload',
            // to ignore runtime.js
            // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
            fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
            include: 'initial'
        }])

        // when there are many pages, it will cause too many meaningless requests
        config.plugins.delete('prefetch')

        // set svg-sprite-loader
        config.module
            .rule('svg')
            .exclude.add(resolve('src/icons'))
            .end()
        config.module
            .rule('icons')
            .test(/\.svg$/)
            .include.add(resolve('src/icons'))
            .end()
            .use('svg-sprite-loader')
            .loader('svg-sprite-loader')
            .options({
                symbolId: 'icon-[name]'
            })
            .end()

        config
            .when(process.env.NODE_ENV !== 'development',
                config => {
                    config
                        .plugin('ScriptExtHtmlWebpackPlugin')
                        .after('html')
                        .use('script-ext-html-webpack-plugin', [{
                            // `runtime` must same as runtimeChunk name. default is `runtime`
                            inline: /runtime\..*\.js$/
                        }])
                        .end()
                    config
                        .optimization.splitChunks({
                            chunks: 'all',
                            cacheGroups: {
                                libs: {
                                    name: 'chunk-libs',
                                    test: /[\\/]node_modules[\\/]/,
                                    priority: 10,
                                    chunks: 'initial' // only package third parties that are initially dependent
                                },
                                elementUI: {
                                    name: 'chunk-elementUI', // split elementUI into a single package
                                    priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                                    test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                                },
                                commons: {
                                    name: 'chunk-commons',
                                    test: resolve('src/components'), // can customize your rules
                                    minChunks: 3, //  minimum common number
                                    priority: 5,
                                    reuseExistingChunk: true
                                }
                            }
                        })
                        // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
                    config.optimization.runtimeChunk('single')
                }
            )
    }
}